How to randomly generate an integer which is unique during multiple iterations

How to generate a random integer in the range of 1 to 100 uniquely when the program is run and which undergoes multiple iterations? When I am using randi as follows, it is generating integer randomly but at times its not unique when the program is run in multiple iterations

index{i} = randi([1 100],1,1);

Answer 1

[Jos (10584)]

You can use the function randperm for this:

N = 10 
  R = randperm(N)
  for k=1:N
     Current_Random_Integer = R(k)
  end

[pavikirthi]

Thanks,it works fine now.